00828nam0 2200277 450 00000879520180619160209.020080108d1963----km-y0itay50------baengUSa-------001yyRadio wave propagation and the ionosphereby Ya. L. Al'pertNew YorkConsultants Bureau1963X, 394 p.ill.28 cmAuthorized translation from the Russian2001IonosferaOnde radioPropagazione onde621.38420Al'pert,Ya. L.604675ITUNIPARTHENOPE20080108RICAUNIMARC000008795621.384/14915645PIST2008Radio wave propagation and the ionosphere1204635UNIPARTHENOPE